Magnum intake drilling plate project

The end holes are drilled at same angle as the magnum bolts, the pipe nipples on those 2 are cut to allow the plates to be bolted up as normal using the bolts to index the plate. The additional pipe nipples are set up to align and maintain the angle for the holes to be drilled. On the second plate the already drilled and tapped holes do the indexing allowing the end holes to be drilled and then tapped. I'm doing it with the materials I have on hand with exception of the nipples that I bought.